Swapping Volunteer Shifts With Different Duties?
Check that each person can do the other job, then agree the new hours. Save the changes in Proximatic so both team leaders know who is coming.
Two volunteers can trade shifts with different duties when the new arrangement works for both jobs. Equal hours don't settle that question. Someone who can greet guests may still need training before they can handle equipment.
Take a welcome volunteer who wants to swap with an equipment helper. If both are approved for both jobs and can cover the new hours, the exchange can work. If the welcome volunteer hasn't learned the equipment role, look for another approved helper to take that work before releasing the original person. You can still help the first volunteer change shifts without leaving an unprepared person in charge.
Add trained equipment helpers to that team in Proximatic and keep the equipment shifts for that team. When a place opens, Find cover looks for someone approved to do the job who is free for the whole shift. It also checks their other assignments, so the person you ask won't already be working at the welcome desk.
Once the new arrangement is agreed, update the assignments and tell the leads who will arrive. Each job has a person who can do it, and the volunteers get the change they needed without a fresh round of confusion at the event.
Create your event and find the right person for each job.
Related: handling a swap request, choosing software for volunteer cover, filling an open volunteer shift.